Question

what are the properties of alkali metals. check all that apply(6)
all the noble gases are found in small amounts in the earths atmosphere
atoms have a single electron in their outermost level, in other words, 1 valence electron.
atoms in the nitrogen family have 5 valence electrons. they tend to share electrons when they bond.
atoms in this family have 3 valence electrons
atoms of this family have 4 valence electrons
atoms of this family have 6 valence electrons
because they do not readily combine with other elements to form compounds, they are called inert.
colorless gases that are extremely un-reactive
found in the first column of the periodic table
halogen atoms only need to gain 1 electron to fill their outermost energy level.
halogens have 7 valence electrons, which explains why they are the most active non - metals. they are never found free in nature.

Explanation:

Alkali metals are in the first column of the periodic table. Their atoms have a single electron in their outermost level (1 valence electron).

Answer:

Atoms have a single electron in their outermost level, in other words, 1 valence electron; found in the first column of the periodic table.